In this article, we offer our reflections on our community-based participatory research (CBPR) project in partnership with Mexican migrants in a new rural destination of the Rocky Mountain West. To set the stage for our work, we first present the Montana migration context – a unique context in which the migrant community is hard to define, locate, and engage. Next, we present who we are and how we forged a partnership with Mexican migrants in Montana. We then provide the details of our project – Salud y Comunidad: Latinos en Montana – and reflect on the pragmatic and ethical challenges of using a CBPR approach in this context. Finally, we attempt to reframe some of the tensions and paradoxes inherent in community-based work with vulnerable communities and reflect on the question, ‘is CBPR a good fit?’ We aim for our analysis to contribute a unique perspective to the rich discussions underway about using CBPR to ameliorate health disparities and promote justice in marginalized communities.